Directions Apple Green Hair Dye
This dye's pretty awesome. I put it over natural medium-brown hair and it went a nice bright shade of green - definitely stood out despite the fact I hadn't bleached my hair before-hand.
The only problem I had was the speed it fades at - but it would probably last much longer on bleached or dyed-blonde hair.
Good stuff, I'd buy it again. Really good price, too.